CN106200999A - Keyboard - Google Patents

Abstract

The invention relates to a keyboard, which includes a controller, M row signal lines, N column signal lines and MxN key units. The row signal lines are respectively electrically coupled to one of the output ports of the controller. The column signal lines are respectively electrically coupled to one of the input ports of the controller. The controller periodically and sequentially passes through the output port, sets the i-th row signal line to a preset voltage, and judges whether the voltage values of the N column signal lines are all lower than the logic high level. When at least one of the voltage values is higher than the logic high level, the controller judges whether the voltage values of the N column signal lines are higher than the critical level, and sets the voltage values of the i-th row signal line and the N column signal lines higher than the critical level. The key unit corresponding to the column signal line of the level is determined to be pressed. Therefore, the present invention can avoid misjudgment that the key unit is pressed when the key unit is not pressed, and misjudge that the key unit is not pressed when the key unit is pressed, thereby avoiding the occurrence of "ghost keys".

Description

keyboard

technical field

The invention relates to a keyboard, in particular to a keyboard with an anti-ghost key function.

Background technique

In order to be able to conveniently use the computer to perform various calculations and application programs, the computer not only needs to have sufficient computing power, but also needs to be equipped with various peripheral input devices to facilitate user operations. Common peripheral input devices include keyboards, mice, microphones, etc. The peripheral input devices can convert user input operations into instructions supported by the computer, and enable the computer to perform calculations accordingly.

Among various peripheral input devices, the keyboard has become an important and popular method because it contains many different keys and can quickly generate various input commands according to the user's operation, such as generating input commands corresponding to various letters. input device. However, as the computer is widely used, users may also use the keyboard to perform various applications, such as document editing or video games. In different application scenarios, the keyboard may be required to accurately generate correct input commands when pressed rapidly and continuously. However, according to the keyboard detection method of today's technology, it may appear that a certain key has not been pressed, but a misjudgment is caused because other adjacent keys are pressed, which is the so-called "ghost key", which causes inconvenience to the user and becomes a Problems to be solved.

Contents of the invention

In order to improve the above problem of ghost keys, the present invention provides a keyboard.

The aforementioned keyboards include:

N analog-to-digital converters;

N constant voltage comparators;

A controller, the controller has N input ports and M output ports, the N input ports can be selectively electrically coupled to N analog-to-digital converters or the N input ports can be selectively electrically coupled to N A constant voltage comparator, M and N are both integers greater than 1;

M row signal lines, the M row signal lines are respectively electrically coupled to one of the M output ports;

N column signal lines, the N column signal lines are respectively electrically coupled to one of the N analog-to-digital converters and one of the N constant voltage comparators, the N column signal lines are connected to the M Row signal lines form MxN switch intersections; and

MxN button units, the MxN button units are respectively arranged at one of the intersections of the MxN switches, each button unit includes a switch, and the two ends of the button unit are electrically coupled to the M row signal lines respectively The X-th row signal line and the Y-th column signal line in the N column signal lines, when the button unit is pressed, the switch will conduct the electrical connection between the X-th row signal line and the Y-th column signal line. Sexual coupling, where integer X ranges from 1 to M and integer Y ranges from 1 to N;

Wherein the controller executes the scanning cycle periodically, when the controller executes the scanning cycle, the controller adjusts i to scan the i-th row signal line among the M row signal lines one by one, and the value of i is set For each value from 1 to M at least once, the scanning cycle includes the following steps:

(a) i=1, start the scanning cycle;

(b) The controller sets the i-th row signal line to a preset voltage through the M output ports, and other row signal lines other than the i-th row signal line can be set to a lower voltage and a floating state. one of the two, the lower voltage is lower than the preset voltage;

(c) The controller is electrically coupled to the N constant voltage comparators through the N input ports, and controls the N constant voltage comparators to respectively receive the voltage values on the N column signal lines to judge the N Whether the voltage values on the column signal lines are all lower than the logic high level;

(d) When the voltage values on the N column signal lines are all lower than the logic high level, it is determined that none of the N button units coupled to the i-th row signal line signal has been pressed;

(e) when i<M, set i=i+1, get back to step (b), when i>=M, jump to step (g);

(f) when at least one of the voltage values on the N column signal lines is higher than the logic high level,

(f1) The controller sets the i-th row signal line to the preset voltage through the M output ports, and sets other signal lines in the M row signal lines except the i-th row signal line to the lower voltage;

(f2) The controller is electrically coupled to the N analog-to-digital converters through the N input ports, and controls the N analog-to-digital converters to receive voltage values on the N column signal lines to determine the N columns Whether the voltage value on the signal line is higher than the critical level;

(f3) determining that the button unit corresponding to the i-th row signal line and the column signal line whose voltage value is higher than the critical level among the N column signal lines is pressed; and

(f4) In the scanning cycle, when the m-th row of signal lines among the M row signal lines has not been set to the preset voltage, set i to m, and return to step f1, otherwise Go to step (g), wherein m is an integer from 1 to M; and

(g) Complete the scan cycle.

As an optional technical solution, the keyboard also includes a switcher, which is used to selectively electrically connect the N input ports with the N analog-to-digital converters or electrical switches according to the control signal sent by the controller. and turning on the N input ports and the N constant voltage comparators.

As an optional technical solution, the logic high level is 0.7 times of the preset voltage.

As an optional technical solution, the critical level is 1/M of the preset voltage.

As an optional technical solution, each key unit further includes a resistor, and the resistor and the switch are connected in series between the X-th row signal line and the Y-th column signal line.

As an optional technical solution, the controller also includes N first-color control ports;

The keyboard also includes N first-color signal lines, and the N first-color signal lines are respectively electrically coupled to one of the N first-color control ports;

Each key unit also includes a first-color light source, wherein two ends of the first-color light source are respectively electrically coupled to the X-th row signal line among the M row signal lines and the N-th row signal line among the N first-color signal lines Y column first color signal line; and

When performing step (b) or step (f1), the controller applies the N first color light control signals to the N first color signal lines respectively through the N first color control ports, by The voltage difference between the N first color light control signals and the i-th row signal line is used to adjust the luminous intensity of the N first-color light sources coupled to the i-th row signal line, thereby affecting the coupling to the i-th row The backlight color of the N button units of the signal line.

As an optional technical solution, the controller also includes N second-color control ports;

The keyboard also includes N second-color signal lines, and the N second-color signal lines are respectively electrically coupled to one of the N second-color control ports;

Each key unit further includes a second-color light source, wherein both ends of the second-color light source are electrically coupled to the X-th row signal line among the M row signal lines and the N-th row signal line among the N second-color signal lines. Y column second color signal lines; and

When performing step (b) or step (f1), the controller applies N second color light control signals to the N second color signal lines respectively through the N second color control ports, and the The voltage difference between the N second color light control signals and the i-th row of signal lines is used to adjust the luminous intensity of the N second-color light sources coupled to the i-th row of signal lines, thereby affecting the coupling to the i-th row of signal lines The backlight color of the N key units.

The present invention also provides a keyboard, which includes:

N analog-to-digital converters;

N constant voltage comparators;

A controller, the controller has N first color control ports, N input ports and M output ports, the N input ports can be selectively electrically coupled to N analog-to-digital converters or the N input ports can be selectively electrically coupled to N constant voltage comparators, where M and N are integers greater than 1;

M row signal lines, the M row signal lines are respectively electrically coupled to one of the M output ports;

N column signal lines, the N column signal lines are respectively electrically coupled to one of the N analog-to-digital converters and one of the N constant voltage comparators, the N column signal lines are connected to the M row signals Lines form MxN switch intersections;

N first color signal lines, the N first color signal lines are respectively electrically coupled to one of the N first color control ports; and

MxN button units, wherein X ranges from 1 to M, and Y ranges from 1 to N. The MxN button units are respectively arranged at one of the MxN switch intersections. Each button unit includes a switch and a first color A light source, wherein the two ends of the key unit are respectively electrically coupled to the X-th row signal line among the M row signal lines and the Y-th column signal line among the N column signal lines, when each key unit is pressed , the corresponding switch will conduct the electrical coupling between the X-th row signal line and the Y-th column signal line, and the two ends of the first color light source are respectively electrically coupled to the X-th column of the M row signal lines. The row signal line and the Y-th column first-color signal line among the N first-color signal lines;

Wherein the controller executes the scanning cycle periodically, when the controller executes the scanning cycle, the controller adjusts i to scan the i-th row signal line among the M row signal lines one by one, and the value of i is set For each value from 1 to M at least once, the scanning cycle includes the following steps:

(a) The controller sets the i-th row signal line to a preset voltage through the M output ports, and sets other row signal lines of the M row signal lines except the i-th row signal line to It is one of the lower voltage and the floating state, the lower voltage and the floating state are different from the preset voltage, the controller controls the N first color lights through the N first color control ports The control signals are respectively applied to the N first color signal lines, and the N coupled to the i-th row signal line is adjusted by the voltage difference between the N first color light control signals and the i-th row signal line. The luminous intensity of a first color light source further affects the backlight color of the N button units coupled to the i-th row of signal lines;

(b) The controller is electrically coupled to the N analog-to-digital converters through the N input ports, and controls the N analog-to-digital converters to receive the voltage values on the N column signal lines to determine the N columns Whether the voltage value on the signal line is higher than the critical level;

(c) judging the button unit corresponding to the i-th row signal line and the column signal line whose voltage value is higher than the critical level among the N column signal lines as being pressed;

(d) In the scan cycle, when the m-th row of signal lines among the M row signal lines has not been set to the preset voltage, set i to m, and return to step (a) , otherwise enter step (e), wherein m is an integer from 1 to M; and

(e) Complete the scan cycle.

As an optional technical solution, the controller also includes N second-color control ports;

The keyboard also includes N second-color signal lines, and the N second-color signal lines are respectively electrically coupled to one of the N second-color control ports;

Each key unit also includes a second color light source, wherein both ends of the second color light source are respectively electrically coupled to the X-th row signal line among the M row signal lines and the Y-th row among the N second-color signal lines. a second color signal line; and

When step (a) is executed, the controller applies N second color light control signals to the N second color signal lines respectively through the N second color control ports, and through the N second color light The voltage difference between the control signal and the i-th row of signal lines is used to adjust the luminous intensity of the N second-color light sources coupled to the i-th row of signal lines, thereby affecting the N key units coupled to the i-th row of signal lines backlight color.

As an optional technical solution, the keyboard also includes a switcher, which is used to selectively electrically connect the N input ports with the N analog-to-digital converters or electrical switches according to the control signal sent by the controller. and turning on the N input ports and the N constant voltage comparators.

Compared with the prior art, the keyboard of the present invention can perform a scan cycle periodically, and in the process of the scan cycle, first compare the voltage and logic high level of each column signal line through a comparator to confirm whether a key is pressed, Then compare the voltage and critical level of each column signal line by the analog-to-digital converter to determine the pressed key unit, so it can avoid being misjudged as being pressed when the key unit is not pressed, and when the key unit is pressed It is misjudged as not being pressed, thereby avoiding the occurrence of "ghost keys".

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

Description of drawings

Fig. 1 is the schematic diagram of the keyboard of an embodiment of the present invention;

Fig. 2 is a voltage timing diagram of each row of signal lines according to an embodiment of the present invention;

FIG. 3 is a flowchart of a controller executing a scan cycle according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a keyboard according to another embodiment of the present invention.

detailed description

FIG. 1 is a schematic diagram of a keyboard according to an embodiment of the present invention, please refer to FIG. 1 . The keyboard 100 includes N analog-to-digital converters ADC(1) to ADC(N), N constant voltage comparators CMP(1) to CMP(N), a controller 110, and M row signal lines C(1) to C (M), N column signal lines R(1) to R(N) and M×N key units K(1,1) to K(M,N), where M and N are integers greater than 1.

The controller 110 has N input ports IN( 1 ) to IN(N) and M output ports OUT( 1 ) to OUT(N). N input ports IN(1) to IN(N) can be selectively electrically coupled to N analog to digital converters (analog to digital converter, ADC) ADC(1) to ADC(N) or N input ports IN(1 ) to IN(N) are selectively electrically coupled to N constant voltage comparators CMP(1) to CMP(N).

In some embodiments of the present invention, N analog to digital converters (analog to digital converter, ADC) ADC(1) to ADC(N) and N constant voltage comparators CMP(1) to CMP(N) are respectively Electrically coupled to N column signal lines R(1) to R(N). In FIG. 1 , N input ports IN(1) to IN(N) can be electrically coupled to N analog-to-digital converters ADC(1) to ADC(N) and N constant voltage comparators CMP via switch 112 (1) to CMP(N), and the controller 110 can further output the control signal SIGctrl to the switcher 112, and the switcher 112 can select and conduct N input ports IN(1) to IN(N) according to the control signal SIGctrl and the electrical coupling between N analog-to-digital converters ADC(1) to ADC(N), or turn on N input ports IN(1) to IN(N) and N constant voltage comparators CMP(1 ) to the electrical coupling between CMP(N).

The M row signal lines C(1) to C(M) are respectively electrically coupled to one of the M output ports OUT(1) to OUT(N) corresponding to one of the output ports, for example, the first row signal line C (1) is electrically coupled to the first output port OUT(1), and the Mth row signal line C(M) is electrically coupled to the Mth output port OUT(M). The N column signal lines R(1) to R(N) are respectively electrically coupled to one of the N analog-to-digital converters ADC(1) to ADC(N) corresponding to one of the analog-to-digital converters and the N constant-voltage comparators CMP (1) to one of the corresponding constant voltage comparators of CMP(N), for example, the first column signal line R(1) is electrically coupled to the analog-to-digital converter ADC(1) and the constant voltage comparator CMP(1 ), and the Nth column signal line R(N) is electrically coupled to the analog-to-digital converter ADC(N) and the constant voltage comparator CMP(N).

N column signal lines R(1) to R(N) intersect with M row signal lines C(1) to C(M) to form MxN switch intersections, and MxN key units K(1,1 ) to K(M,N) will be set at one of the MxN switch intersections.

For example, the button unit K(X,Y) will be set at the intersection of the switch formed by the signal line C(X) of the row X and the signal line R(Y) of the column Y, where the value of the parameter X ranges from 1 to M , while the parameter Y ranges from 1 to N. The key unit K(X,Y) includes a switch S(X,Y). In some embodiments of the present invention, the key unit K(X,Y) may also include a resistor Z(X,Y), and the resistor Z(X,Y) may be a specific additional resistance component, or may be a key unit K( X, Y) line equivalent resistance.

The resistor Z(X,Y) and the switch S(X,Y) can be connected in series between the X-row signal line C(X) and the Y-th column signal line R(Y), that is, the key unit K(X,Y) The two terminals of are respectively electrically coupled to the X-th row signal line C(X) and the Y-th column signal line R(Y). When the key unit K(X,Y) is pressed, the switch S(X,Y) will conduct the electrical coupling between the X-row signal line C(X) and the Y-th column signal line R(Y). , the potential signal on the Xth row signal line C(X) is transmitted to the Yth column signal line R(Y).

The controller 110 can periodically execute the scan cycle. When the controller 110 executes the scan cycle, the controller 110 can scan the i-th row of signal lines among the M row signal lines one by one by adjusting the parameter i. , the value of parameter i will be set to each value from 1 to M at least once.

FIG. 2 is a voltage timing diagram of each row of signal lines according to an embodiment of the present invention, please refer to FIG. 2 . The scan cycle can scan each row of signal lines in corresponding time periods P(1) to P(M) by increasing the value of parameter i from 1 to M. For example, when the parameter i is 1 in the period P(1), the controller 110 can increase the voltage of the signal line C(1) in the first row, and at the same time set the voltages of the signal lines in other rows to be lower. Low voltage, so that each column signal line R(1) can be judged by N constant voltage comparators CMP(1) to CMP(N) or analog-to-digital converters ADC(1) to ADC(N) To the magnitude of the voltage on R(N), to know the pressing status of each key unit in the first row. After the judgment is completed, the controller 110 can increase the parameter i to 2, at this time, the scanning cycle enters the period P(2), and the controller 110 can increase the voltage of the signal line C(2) of the second row, and at the same time make the other rows The voltage of the signal line is set at a lower voltage to determine the pressing status of each key unit in the second row. By analogy, the controller 110 can continue to increment the parameters to 3, . The pressing status of the key unit. In this way, the pressing status of all key units can be judged and the scanning cycle can be completed. In addition, in some embodiments of the present invention, the controller 110 may also decrement the parameter i from M to 1, or judge the pressing status of each row of key units in other order.

FIG. 3 is a flow chart of a controller executing a scan cycle according to an embodiment of the present invention, please refer to FIG. 3 . The flow of the scanning cycle includes step S210 to step S270.

S210: Set the value of parameter i to 1;

S220: The controller 110 sets the i-th row signal line C(i) to a preset voltage VH through the M output ports OUT(1) to OUT(M), and sets the signal lines of other rows other than the i-th row to One of the lower voltage VL and the floating state;

S230: The controller 110 is electrically coupled to N constant voltage comparators CMP(1) to CMP(N) through N input ports IN(1) to IN(N), and controls the N constant voltage comparators CMP(1 ) to CMP(N) respectively receive the voltage values on the N column signal lines R(1) to R(N) to determine whether the voltage values on the N column signal lines R(1) to R(N) are lower than Logical high level VIH;

S240: When the voltage values on the N column signal lines R(1) to R(N) are all lower than the logic high level VIH, determine that the N key units K(i,1) to K(i,N) are all is not pressed, and execute step S250, and when at least one of the voltage values on the N column signal lines R(1) to R(N) is higher than the logic high level VIH, then execute step S260;

S250: when i<M, set the parameter i to i+1, and return to step S220, and when i>=M, then execute step S270;

S260: The controller 110 sets the i-th row signal line C(i) to a preset voltage VH through the M output ports OUT(1) to OUT(M), and sets the M row signal lines C(1) to C In (M), other row signal lines except the i-th row signal line C(i) are set to a lower voltage VL;

S262: The controller 110 is electrically coupled to N analog-to-digital converters ADC(1) to ADC(N) through N input ports IN(1) to IN(N), and controls the N analog-to-digital converters ADC(1 ) to ADC(N) to receive the voltage values on the N column signal lines R(1) to R(N) to determine whether the voltage values on the N column signal lines R(1) to R(N) are higher than the critical bit Quasi-Vt;

S264: Determine the button unit corresponding to the column signal line whose voltage value is higher than the critical level Vt among the i-th row signal line C(i) and the N column signal lines R(1) to R(N) as being pressed ;

S266: When the m-th row of signal lines among the M row signal lines C(1) to C(M) has not been set to a preset voltage, set the parameter i to m, and return to step S260, otherwise Enter step S270, wherein m is an integer not less than 1 and not greater than M;

S270: Complete the scanning cycle.

In step S210, the controller 110 can first set the value of the parameter i to 1 to start the scan cycle, and can gradually set the parameter i to 2 to M during the scan cycle to ensure During the process, the signal lines C(1) to C(M) of each row will be set to the preset voltage VD and scanned.

In step S220, the controller 110 can set the i-th row signal line C(i) to a preset voltage VH through the M output ports OUT(1) to OUT(M), and set the i-th row signal line C( Other row signal lines other than i) are set to one of a lower voltage VL and a floating state. When the other row signal lines other than the i-th row signal line C(i) are set to one of a lower voltage VL and a floating state, their states are all different from being set to a preset voltage VH. At this time, if the key units K(i,1) to K(i,N) corresponding to the i-th row of signal lines C(i) are pressed, for example, if the key unit K(i,1) is pressed, The switch S(i,1) will conduct the electrical connection between the signal line R(1) in the first column and the signal line C(i) in the i-th row, so that the potential of the signal line R(1) in the first column will be is boosted close to the preset voltage VH.

Therefore, in step S230, the controller 110 is electrically coupled to N constant voltage comparators CMP(1) to CMP(N) through N input ports IN(1) to IN(N), and controls the N constant voltage comparators The comparators CMP(1) to CMP(N) respectively receive the voltage values on the N column signal lines R(1) to R(N) to determine the voltages on the N column signal lines R(1) to R(N) Whether the value is lower than the logic high level VIH. In some embodiments of the present invention, the voltage value of the logic high level VIH is close to the voltage value of the preset voltage VH. However, in order to avoid misjudgment caused by the two being too close, it is not appropriate to set the voltage value of the two In order to be too close, it is preferable that the logic high level VIH is slightly lower than the preset voltage VH, for example, the logic high level VIH may be 0.7 times the preset voltage. By judging the potentials of the N columns of signal lines R(1) to R(N) and the logic high level VIH, it can be preliminarily judged whether any key unit is pressed.

In step S240, if the voltage values on the N column signal lines R(1) to R(N) are all lower than the logic high level VIH, it means that the voltages of the N column signal lines R(1) to R(N) None of the voltage values is electrically coupled to the signal line C(i) of the i-th row, so the voltage does not increase significantly. At this time, it can be determined that the N key units K(i,1) to K(i,N) are not is pressed, and step S250 is executed.

In step S250, the controller 110 will check the value of the parameter i, if i>=M, it means that each row of signal lines C(1) to C(M) has been scanned, and at this time, it will enter step S270 and The scanning cycle is completed, and step S210 is re-executed until a period of waiting time elapses. If i<M, the controller 110 adjusts the parameter i, for example, updates the parameter i to i+1, and returns to step S220 to scan the next row of signal lines.

In addition, in step S240, if at least one of the voltage values on the N column signal lines R(1) to R(N) is higher than the logic high level VIH, for example, the voltage of the first column signal line R(1) When the value is higher than the logic high level VIH, it means that some of the key units are pressed, so that the preset voltage VH on the i-th row signal line C(i) can be transmitted to the first column signal line R(1).

For example, if the key unit K(i,1) is pressed, the switch S(i,1) will conduct the electric current between the signal line R(1) in the first column and the signal line C(i) in the ith row. Sexual connection, so that the potential of the signal line R(1) in the first column will be raised to be close to the preset voltage VH. However, in some embodiments of the present invention, when the key unit K(i, 1) is not pressed, the potential of the signal line R(1) in the first column may still rise due to other key units being pressed.

For example, if the key units K(i,2), K(i+1,2) and K(i+1,1) are all pressed at the same time, the switches S(i,2), S(i+ 1,2) and S(i+1,1) will be turned on, so the high potential on the signal line C(i) in the i-th row can be coupled to the signal line R( 2), and coupled to the i+1th row signal line C(i+1) through the switch S(i+1,2), and then coupled to the first column signal line R through the switch S(i+1,1) (1).

In other words, as long as the pressed key unit can provide a circuit to electrically couple the i-th row signal line C(i) to the first column signal line R(1), it may happen that the key unit K(i, 1) itself is not pressed, The case where the potential of the signal line R(1) in the first column is pulled up. In this case, if it is rashly determined that the key unit K(i,1) is pressed, or the actually pressed key units K(i,2), K(i+1,2) and K(i+1) are not ,1) If it is determined that it has been pressed, it will cause a "ghost key" and cause trouble in use.

In order to avoid misjudgment, in step S260, the controller 110 still sets the i-th row signal line C(i) to a preset voltage VH through the M output ports OUT(1) to OUT(M), and sets the M output ports OUT(1) to OUT(M) to a preset voltage VH The row signal lines other than the i-th row signal line C(i) among the row signal lines C(1) to C(M) are set to a lower voltage VL. Then in step S262, the controller 110 can be electrically coupled to N analog-to-digital converters ADC(1) to ADC(N) through N input ports IN(1) to IN(N), and control the N analog-digital converters The converters ADC(1) to ADC(N) receive the voltage values on the N column signal lines R(1) to R(N) to determine the voltage values on the N column signal lines R(1) to R(N) Is it higher than the critical level Vt.

In some embodiments of the present invention, when some of the key units in the same column, such as key units K(1,1) to K(M,1), are pressed at the same time, the signal from the i-th row The preset voltage input by the line C(i) may be divided by the resistors in the simultaneously pressed key units, so that the potential of the first column signal line R(1) may be much lower than the preset voltage VH. In a more extreme case, if the M key units K(1,1) to K(M,1) in the first column are all pressed at the same time, the key units in the i-th row will be connected with other M-1 The parallel resistors of the two button units divide the voltage together, and at this time the potential of the first column signal line R(1) may only be

(VH-VL)/M, even lower than the preset voltage VH.

In order to avoid misjudgment, the threshold level Vt can be set to be smaller than the logic high level VIH. According to the above situation, the threshold level Vt can also be set to one M of the preset voltage VH. Since the voltage level of the critical level Vt is relatively low, the voltage of the signal line is compared with the critical level Vt through the analog-to-digital converter to make the judgment result more accurate.

In step S264, the controller 110 may map the i-th row signal line C(i) and the column signal lines whose voltage value is higher than the critical level Vt among the N column signal lines R(1) to R(N) to the corresponding The button unit is judged to be pressed. For example, if among the N column signal lines R(1) to R(N), the voltage values of the first column signal line R(1) and the second column signal line R(2) are higher than the critical level Vt, Then the controller 110 can connect the key units K(i,1) and K(i) corresponding to the i-th row signal line C(i), the first column signal line R(1) and the second column signal line R(2) ,2) It is judged as pressed. In this way, it can be detected that there is a pressed key unit among the key units corresponding to the signal line C(i) in the i-th row, so as to avoid the occurrence of “ghost keys”.

After step S264 is completed, the controller 110 will further check in step S266 whether any row signal lines among the M row signal lines C(1) to C(M) have not been set to the preset voltage VH, or not. That is, it is checked whether there are any row signal lines that have not been scanned. For example, if the controller 110 judges that the signal line of the mth row has not been set to the preset voltage VH, the controller 110 can set the parameter i as m, and return to step S260 to continue to use the analog-to-digital converter to Comparing the relationship between the voltages of the signal lines of each column and the critical level Vt to detect whether any key is pressed. m is an integer not smaller than 1 and not larger than M.

And if all the row signal lines C(1) to C(M) have been set to the preset voltage VH once, the controller 110 can enter step S270 and complete the scan cycle.

Since the keyboard 100 can perform a scan cycle periodically, and in the process of the scan cycle, the voltages on the column signal lines R(1) to R(N) and The logic high level VIH is used to confirm whether a button is pressed, and then compare the voltage on the signal lines R(1) to R(N) of each column and the critical level Vt through the analog-to-digital converter ADC(1) to ADC(N) In order to determine the pressed key unit, it is possible to avoid misjudging that the key unit is pressed when it is not pressed, or misjudging that it is not pressed when the key unit is pressed, thereby avoiding the occurrence of "ghost keys".

FIG. 4 is a schematic diagram of a keyboard according to another embodiment of the present invention, please refer to FIG. 4 . The keyboard 200 is similar in structure and operation principle to the keyboard 100 . The keyboard 200 includes N analog-to-digital converters ADC(1) to ADC(N), N constant voltage comparators CMP(1) to CMP(N), a controller 210, and M row signal lines C(1) to C (M), N column signal lines R(1) to R(N), N first color signal lines T1(1) to T1(N), and MxN key units K'(1,1) to K' (M,N). In addition to the components and functions of the controller 110, the controller 210 also includes N first color control ports CL1(1) to CL1(N). The N first color signal lines T1(1) to T1(N) are respectively electrically coupled to corresponding first color control ports among the N first color control ports CL1(1) to CL1(N). For example, the first color signal line T1(1) can be electrically coupled to the first color control port CL1(1), and the first color signal line T1(N) can be electrically coupled to the first color control port CL1(N) .

In addition, each key unit K'(X,Y) may also include the first color light source L1(X,Y) in addition to the switch S(X,Y). The two ends of the first color light source L1(X, Y) are respectively electrically coupled to the Xth row signal line C(X) among the M row signal lines C(1) to C(M) and the N first color signals The Y-th column first color signal line T1(Y) among the lines T1(1) to T1(N). By inputting an appropriate voltage to the Xth row signal line C(X) and the Yth column first color signal line T1(Y), the first color light source L1(X,Y) can be controlled to emit light. For example, when the signal line C(X) in row X is at a higher potential VH, and the first color signal line T1(Y) in column Y is at a lower potential VL, the first color light source L1(X,Y) The voltage difference between the two ends can turn on the first color light source L1 (X, Y), and make the first color light source L1 (X, Y) emit the first color light. The luminance of the first color light source L1 (X, Y) can be further adjusted by adjusting the voltage difference between the two ends of the first color light source L1 (X, Y).

Since in the scanning cycle process shown in FIG. 2 , the controller 210 can alternately set the signal lines C(1) to C(N) of N rows to the preset voltage VH in step S220 and step S260, so in the present invention In some embodiments, the controller 210 can also transmit the N first color light control signals through the N first color control ports CL1(1) to CL1(N) SIG1(1) to SIG1(N) are applied to the N first color signal lines T1(1) to T1(N) respectively, through the N first color light control signals SIG1(1) to SIG(N) and The voltage difference between the i-th row of signal lines C(i) is used to adjust the luminous intensity of the N first color light sources L1(i,1) to L1(i,N) coupled to the i-th row of signal lines C(i). , thereby affecting the backlight color of the N key units K'(i,1) to K'(i,N) coupled to the i-th row of signal lines C(i).

That is to say, the keyboard 200 can simultaneously control the luminous intensity of the first color light source L1 (X, Y) when the controller 210 executes the scanning cycle, so the operation process of the keyboard 200 can be simplified, and the hardware complexity of the controller 210 can be further reduced. . In addition, since the period of executing the scanning cycle is relatively short, when the first color light source L1 (X, Y) is turned on during the scanning cycle, the light emitted by the first color light source L1 (X, Y) will not make the The user feels flickering, but the user can still feel the effect of steady light.

In FIG. 4, the controller 210 can also include N second color control ports CL2(1) to CL2(N), and the keyboard 200 can also include N second color signal lines T2(1) to T2(N). , and the N second color signal lines T2(1) to T2(N) are respectively electrically coupled to a corresponding one of the N second color control ports CL2(1) to CL(N).

The key unit K'(X,Y) may further include a second color light source L2(X,Y). The two ends of the second color light source L2(X, Y) can be electrically coupled to the X-th row signal line C(X) among the M row signal lines C(1) to C(M) and the N second color signals respectively. The second color signal line T2(Y) of the Yth column among the lines T2(1) to T2(N).

The controller 210 can also control the N second color control ports CL2( 1 ) to CL2(N) according to the above method of controlling the N first color control ports CL1( 1 ) to CL1(N). In other words, the controller 210 can transmit the N second color light control signals SIG2(1) to SIG2 through the N second color control ports CL2(1) to CL2(N) while executing step S220 and/or step S260 (N) are respectively applied to the N second color signal lines T2(1) to T2(N), through the N second color light control signals SIG2(1) to SIG2(N) and the i-th row signal line C( i) to adjust the luminous intensity of the N second color light sources L2(i,1) to L2(i,N) coupled to the i-th row of signal lines C(i), thereby affecting the coupling to the i-th row of signal lines C(i) Backlight colors of the N key units K(i,1) to K(i,N) of the row signal line C(i).

In some embodiments of the present invention, the first color light source L1 (X, Y) and the second color light source L2 (X, Y) can emit light of different colors, so the controller 210 can control the signal through the first color light and The second color light control signal makes the first color light source L1 (X, Y) and the second color light source L2 (X, Y) emit light of different intensities, and then the light emitted by the two can be mixed into different colors and transformed. Effect. In some embodiments of the present invention, the keyboard 200 may also include a third color light source, and use a structure and method similar to the above-mentioned control of the first color light source L1 (X, Y) and the second color light source L2 (X, Y) to control the third color light source, so that the backlight effect of the keyboard 200 can be richer.

For example, the first color light source, the second color light source and the third color light source can be respectively red light source, blue light source and green light source. In this way, by adjusting the intensity ratio of the three color light sources, various colors can be mixed. Different color lights make the keyboard user experience richer and more diverse.

To sum up, the keyboard of the present invention can perform a scan cycle periodically, and in the process of the scan cycle, first compare the voltage and logic high level of each column signal line through a comparator to confirm whether a key is pressed, and then Compare the voltage and critical level of each column signal line through the analog-to-digital converter to determine the pressed key unit, so it can avoid misjudgment that the key unit is pressed when the key unit is not pressed, and misjudgment when the key unit is pressed. In order to avoid the occurrence of "ghost keys" because they are not pressed. At the same time, through the signal lines of each row and the signal lines of each color, the backlight light source of the keyboard can be further illuminated during the scanning cycle, and the color of the backlight can be adjusted to achieve the effect of simplifying the control process and simplifying the hardware equipment.

Certainly, the present invention also can have other various embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding changes All changes and modifications should belong to the scope of protection of the appended claims of the present invention.

Claims (10)

1. A keyboard, characterized in that the keyboard comprises: N analog-to-digital converters; N constant voltage comparators; a controller, the controller has N input ports and M output ports, the N input ports can be selectively electrically coupled to the N analog-to-digital converters or the N input ports can be selectively electrically coupled to the N constant voltage comparators, M and N are both integers greater than 1; M row signal lines, the M row signal lines are respectively electrically coupled to one of the M output ports; N column signal lines, the N column signal lines are respectively electrically coupled to one of the N analog-to-digital converters and one of the N constant voltage comparators, the N column signal lines are connected to the M The row signal lines form MxN switch intersections; and MxN button units, the MxN button units are respectively arranged at one of the intersections of the MxN switches, each button unit includes a switch, and the two ends of the button unit are electrically coupled to the M row signal lines respectively The X-th row signal line and the Y-th column signal line in the N column signal lines, when the button unit is pressed, the switch will conduct the electrical connection between the X-th row signal line and the Y-th column signal line. Sexual coupling, where integer X ranges from 1 to M and integer Y ranges from 1 to N; Wherein the controller executes the scanning cycle periodically, when the controller executes the scanning cycle, the controller adjusts i to scan the i-th row signal line among the M row signal lines one by one, and the value of i is set For each value from 1 to M at least once, the scanning cycle includes the following steps: (a) i=1, start the scanning cycle; (b) The controller sets the i-th row signal line to a preset voltage through the M output ports, and other row signal lines other than the i-th row signal line can be set to a lower voltage and a floating state. one of the two, the lower voltage is lower than the preset voltage; (c) The controller is electrically coupled to the N constant voltage comparators through the N input ports, and controls the N constant voltage comparators to respectively receive the voltage values on the N column signal lines to judge the N Whether the voltage values on the column signal lines are all lower than the logic high level; (d) When the voltage values on the N column signal lines are all lower than the logic high level, it is determined that none of the N button units coupled to the i-th row signal line signal has been pressed; (e) when i<M, set i=i+1, get back to step (b), when i>=M, jump to step (g); (f) when at least one of the voltage values on the N column signal lines is higher than the logic high level, (f1) The controller sets the i-th row signal line to the preset voltage through the M output ports, and sets other signal lines in the M row signal lines except the i-th row signal line to the lower voltage; (f2) The controller is electrically coupled to the N analog-to-digital converters through the N input ports, and controls the N analog-to-digital converters to receive voltage values on the N column signal lines to determine the N columns Whether the voltage value on the signal line is higher than the critical level; (f3) determining that the button unit corresponding to the i-th row signal line and the column signal line whose voltage value is higher than the critical level among the N column signal lines is pressed; and (f4) In the scanning cycle, when the m-th row of signal lines among the M row signal lines has not been set to the preset voltage, set i to m, and return to step f1, otherwise Go to step (g), wherein m is an integer from 1 to M; and (g) Complete the scan cycle. 2. The keyboard according to claim 1, characterized in that the keyboard further comprises a switcher for selectively electrically connecting the N input ports with the N input ports according to a control signal sent by the controller. An analog-to-digital converter is electrically connected to the N input ports and the N constant voltage comparators. 3. The keyboard as claimed in claim 1, wherein the logic high level is 0.7 times of the preset voltage. 4. The keyboard as claimed in claim 1, wherein the critical level is one-M of the preset voltage. 5 . The keyboard according to claim 1 , wherein each key unit further comprises a resistor, and the resistor and the switch are connected in series between the Xth row signal line and the Yth column signal line. 6. The keyboard of claim 1, wherein: The controller also includes N first-color control ports; The keyboard also includes N first-color signal lines, and the N first-color signal lines are respectively electrically coupled to one of the N first-color control ports; Each key unit also includes a first-color light source, wherein two ends of the first-color light source are respectively electrically coupled to the X-th row signal line among the M row signal lines and the N-th row signal line among the N first-color signal lines Y column first color signal line; and When performing step (b) or step (f1), the controller applies the N first color light control signals to the N first color signal lines respectively through the N first color control ports, by The voltage difference between the N first color light control signals and the i-th row signal line is used to adjust the luminous intensity of the N first-color light sources coupled to the i-th row signal line, thereby affecting the coupling to the i-th row The backlight color of the N button units of the signal line. 7. The keyboard of claim 6, wherein: The controller also includes N second color control ports; The keyboard also includes N second-color signal lines, and the N second-color signal lines are respectively electrically coupled to one of the N second-color control ports; Each key unit further includes a second-color light source, wherein both ends of the second-color light source are electrically coupled to the X-th row signal line among the M row signal lines and the N-th row signal line among the N second-color signal lines. Y column second color signal lines; and When performing step (b) or step (f1), the controller applies N second color light control signals to the N second color signal lines respectively through the N second color control ports, and the The voltage difference between the N second color light control signals and the i-th row of signal lines is used to adjust the luminous intensity of the N second-color light sources coupled to the i-th row of signal lines, thereby affecting the coupling to the i-th row of signal lines The backlight color of the N key units. 8. A keyboard, characterized in that the keyboard comprises: N analog-to-digital converters; N constant voltage comparators; A controller, the controller has N first color control ports, N input ports and M output ports, the N input ports can be selectively electrically coupled to the N analog-to-digital converters or selectively electrically Coupled to the N constant voltage comparators, M and N are integers greater than 1; M row signal lines, the M row signal lines are respectively electrically coupled to one of the M output ports; N column signal lines, the N column signal lines are respectively electrically coupled to one of the N analog-to-digital converters and one of the N constant voltage comparators, the N column signal lines are connected to the M row signals Lines form MxN switch intersections; N first color signal lines, the N first color signal lines are respectively electrically coupled to one of the N first color control ports; and MxN button units, wherein X ranges from 1 to M, and Y ranges from 1 to N. The MxN button units are respectively arranged at one of the MxN switch intersections. Each button unit includes a switch and a first color A light source, wherein the two ends of the key unit are respectively electrically coupled to the X-th row signal line among the M row signal lines and the Y-th column signal line among the N column signal lines, when each key unit is pressed , the corresponding switch will conduct the electrical coupling between the X-th row signal line and the Y-th column signal line, and the two ends of the first color light source are respectively electrically coupled to the X-th column of the M row signal lines. The row signal line and the Y-th column first-color signal line among the N first-color signal lines; Wherein the controller executes the scanning cycle periodically, when the controller executes the scanning cycle, the controller adjusts i to scan the i-th row signal line among the M row signal lines one by one, and the value of i is set For each value from 1 to M at least once, the scanning cycle includes the following steps: (a) The controller sets the i-th row signal line to a preset voltage through the M output ports, and sets the other row signal lines of the M row signal lines except the i-th row signal line to One of the lower voltage and the floating state, the lower voltage and the floating state are different from the preset voltage, the controller controls the N first color lights through the N first color control ports The signals are respectively applied to the N first color signal lines, and the N number of signals coupled to the i-th row signal line are adjusted by the voltage difference between the N first color light control signals and the i-th row signal line. The luminous intensity of the first color light source further affects the backlight color of the N key units coupled to the i-th row of signal lines; (b) The controller is electrically coupled to the N analog-to-digital converters through the N input ports, and controls the N analog-to-digital converters to receive the voltage values on the N column signal lines to determine the N columns Whether the voltage value on the signal line is higher than the critical level; (c) judging the button unit corresponding to the i-th row signal line and the column signal line whose voltage value is higher than the critical level among the N column signal lines as being pressed; (d) In the scan cycle, when the m-th row of signal lines among the M row signal lines has not been set to the preset voltage, set i to m, and return to step (a) , otherwise enter step (e), wherein m is an integer from 1 to M; and (e) Complete the scan cycle. 9. The keyboard of claim 8, wherein: The controller also includes N second color control ports; The keyboard also includes N second-color signal lines, and the N second-color signal lines are respectively electrically coupled to one of the N second-color control ports; Each key unit also includes a second color light source, wherein both ends of the second color light source are respectively electrically coupled to the X-th row signal line among the M row signal lines and the Y-th row among the N second-color signal lines. a second color signal line; and When step (a) is executed, the controller applies N second color light control signals to the N second color signal lines respectively through the N second color control ports, and through the N second color light The voltage difference between the control signal and the i-th row of signal lines is used to adjust the luminous intensity of the N second-color light sources coupled to the i-th row of signal lines, thereby affecting the N key units coupled to the i-th row of signal lines backlight color. 10. The keyboard according to claim 8, characterized in that the keyboard further comprises a switcher for selectively electrically conducting the N input ports with the N input ports according to a control signal sent by the controller. An analog-to-digital converter is electrically connected to the N input ports and the N constant voltage comparators.